.box {
  width: 100vw;
  height: 100vh;
  background-color: black;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
}
.box .backbut {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 20vw;
  height: 6vh;
  background-color: blue;
  color: white;
  text-decoration: none;
}
